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Accounts payable and accrued expenses, and Other noncurrent liabilities - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Jul. 31, 2021 USD ($) item | Feb. 28, 2021 USD ($) item
Vendor Agreement |  |  |
Accounts payable and other noncurrent liabilities |  |  |
Payable to vendor | $ 7,800 |  |
Imputed interest rate | 5.00% |  |
Percentage of accounts payable and noncurrent liabilities | 41.00% |  |
Interest expense | $ 190 |  |
Vendor Agreement One |  |  |
Accounts payable and other noncurrent liabilities |  |  |
Payable to vendor |  |  | $ 1,500
Number of payments to be made | item |  |  | 5
Vendor Agreement Two |  |  |
Accounts payable and other noncurrent liabilities |  |  |
Payable to vendor |  |  | $ 7,200
Number of payments to be made | item |  |  | 6
Vendor Agreement Three |  |  |
Accounts payable and other noncurrent liabilities |  |  |
Payable to vendor |  | $ 500 |
Number of payments to be made | item |  | 12 |

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